Accounts Payable and Other Liabilities - Restructuring (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Restructuring Costs Liability at December 31, 2013	$ 21,691,000
Restructuring Costs Incurred for the Year Ended December 31, 2014	1,619,000
Cash Payments for the Year Ended December 31, 2014	23,220,000
Restructuring Costs Liability at December 31, 2014	90,000
Total Cumulative Restructuring Costs Expected to Be Incurred	23,310,000
Office Closure
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,600,000	4,700,000
Parent Merger
Restructuring Reserve [Roll Forward]
Total Cumulative Restructuring Costs Expected to Be Incurred	18,100,000
Severance - management and other personnel
Restructuring Reserve [Roll Forward]
Restructuring Costs Liability at December 31, 2013	21,691,000
Restructuring Costs Incurred for the Year Ended December 31, 2014	1,130,000
Cash Payments for the Year Ended December 31, 2014	22,821,000
Restructuring Costs Liability at December 31, 2014	0
Total Cumulative Restructuring Costs Expected to Be Incurred	22,821,000
Other
Restructuring Reserve [Roll Forward]
Restructuring Costs Liability at December 31, 2013	0
Restructuring Costs Incurred for the Year Ended December 31, 2014	489,000
Cash Payments for the Year Ended December 31, 2014	399,000
Restructuring Costs Liability at December 31, 2014	90,000
Total Cumulative Restructuring Costs Expected to Be Incurred	$ 489,000